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Authors
Liu, Gang-Qin
Zhang, Yu-Ran
Chang, Yan-Chun
Yue, Jie-Dong
Fan, Heng
Pan, Xin-Yu
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Article History
Received: 7 August 2014
Accepted: 21 February 2015
First Online: 2 April 2015
Competing interests
: The authors declare no competing financial interests.
